Daily Practice

Foundation

22nd May 2026

5 questions · Foundation tier · 282 questions in this band

1
Choropleth Maps
Give one limitation of choropleth maps.
2
Data Cleaning and Outliers (Foundation)
A data set of ages is: 12, 13, 12, 14, 13, 99. Which value is most likely an outlier?
3
Correlation and Causation (Foundation)
Two variables have a correlation coefficient close to 0. What does this suggest?
4
Risk (Foundation)
Using your answers to the previous question, find the relative risk for phone users compared with non-users, and interpret it.
5
Skewness by Inspection
A shop's till receipts have mode 5 pounds, median 8 pounds, mean 15 pounds. State the type of skew and give a reason.

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